Machine for dressing stones



4 Sheets-Sheet 1.

(No Model.)

I; MEISEL. MACHINE FOR'DRES SING STONE.

Patented Mar. 4, 1884.

WITNESSES (No Model.)

I 4 Sheets-Sheet 2. F. MEISEL. MACHINE FOR DRESSING STONE.

Patented Mar. 4, 1884.

IW|TNE55E5 INVENTUH (No Model.) 4 Sheets-Sheet 3.

I. MEIS EL. v 4 MACHINE FOR DRESSING-STONE.

N0.294,401 Patented Mar.4,1884.

N. PETERS. PIvolo-Lflhograaher. Washinglm h. c.

. (No Model. 4 ShetsSneet 4.

F. MEISEL. MACHINE FOR DRESSING STONE.

Patented Mar. 4, 1884.

4 INVENTEIH llNiTEn STAT-ES PATENT OFFICE.

FRANCIS MEISEL, OF BOSTON, MASSACHUSETTS.

MACHINE: FoR DRESSlNG STONES.

SPECIFICATION formingpart of-Letters Patent No. 294,401, dated March 4,1884. v application rua m 29,1883. ('No model.)

To all whom it may concern.-

Be it known that I, FRANCIS Mnrsnna citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented certain Improvements in Machines for Planing Lithographicand other Soft Stone, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, makingpart of this specification, in which- Figure 1 is an elevation of oneside of my improved stone-planing machine. Fig. 2 is a plan of the same.Fig. 3 is an elevation of the side of the same opposite to thatrepresented in Fig. 1. Fig. 4. is a longitudinal vertical sectionthrough the center of the same. Fig. 5 is an end elevation of the same;Figs. '6'and 7, sectional details. Fig. 8 is atransverse verticalsection through the machine on theline a: x of Fig. 3. Fig. 9 is aperspective viewof the cutter-stock and cutters. Fig. 10 is a section onthe line y y of Fig. 7. Fig. 11 is a transverse vertical section(enlarged) throughthe cutter-stock and cutters.

for dressing lithographic stones after use, in

order to remove the designs drawn thereon in ink, and give them a smoothand level surface, ready for new work, consists in rubbing another stoneover the surface, with fine sand and water between the two. Thisoperation is, however, slow and tedious, and requires great skill torender the surface perfectly level and uniform, as is necessary,especially when the stones are to beused in large cylinder-presses.

Machines have been also employed for this purpose, in which a revolvingmetallic disk was used for grinding down and polishing the surfaceofvthe stone, and a knife or scraper has also been employed inconnection with a reciprocating carriagefor supporting the stone, thescraper acting upon its surface during its movement in: one directiononly. None of these machines have, however,- accomplished the desiredend in a sufficiently rapid andper- .fect manner to. warrant theirgeneral use.

To facilitate the operation of dressing the stone, and to enable thework to be performed much more rapidly, and at the same time obtain aperfect uniform level over the entire surface of the stone, and also toobtain stones.

previous to the arrival of the stone at the end of its traverse ineither direction; and my invention also consists in certain details ofconstruction, as hereinafter set forth and specifically claimed.

In the said drawings, A represents the bed or frame-work of the machine,which is provided with guideways b b, on which slides a carriage, B,upon which is secured, by any suitable device, the lithographic or othersoft stone, O, to be planed. This carriage has secured to its under sidea heavy lug or projection, a, through a threaded aperture in whichpasses a long horizontal screw-shaft, D,which is supported in suitablebearings, d'e, secured to the bed A between the ways b b. e

To one end of the shaft .D is secured a large gear, E, which is drivenby a smaller gear or pinion, G, on a short shaft, f, upon which aremounted two driving or fast pulleys, g h, between which are arrangedthree pulleys, i 2, running loosely upon the said shaft f.

m n are the belt-shippers, by means of which the belts p q arealternately shifted from the fast to the loose pulleys, and vice versa,to cause the screw-shaft to be rotated in opposite directions, wherebythe carriage is traversed backward and forward'from one end of the bedAto the other. The central loose pulley, k, onto which each of the beltslap when shifted from its fast pulley, serves to prevent one belt frombeing end of a rock-shaft, H, having its hearings in the frame-work, andextendingtransversely through the same from one side to the other, theshaft H being provided near its opposite end wit-h a lever, it, which isalternately vi- 'brated in opposite directions by adjustable projectionsv w at the opposite ends of the carriage B, and thus, through theconnections described, the belts p q are shifted and the motion of thescrew-shaft D reversed as soon as the carriage has arrived at the end ofits traverse in either direction.

On each side of the frame-work A is bolted a heavy standard, I, andbetween these standards is placed a cross-head, K, the ends of which fitwithin vertical slots a in the standards. This cross head K, whichcarries the cutters or scraping-knives to be hereinafter described, issupported at its opposite ends by two vertical screw-shafts, b, whi chpass through the cap-piece L, secured to the upper ends of thestandards. These screw-shafts Z) are provided at their upper ends withworm-gears c, which are rotated by worms (1 on a horizontal shaft, M,having its bearings in projections rising from the cap-piece L. Theshaft M is provided at one end with a ratchet-wheel, c, which is rotatedin the same direction alternately by the pawlsf g, pivoted to levers hi, oscillating freely upon the shaft M, and arranged upon opposite sidesof the ratchetwheel. These levers are connected by rods k l with theupper end of a lever, J, secured to the end of the rock-shaft H, thevibration of which at the end of each traverse of the carriage B, by thecontact of one of the projections 1 10, with the lever 11, as previouslydescribed, thus causing the rotation of the ratchet-wheel eandscrew-shafts b, and the downward feed of the cross-head K and cuttersattached thereto, the arrangement of the pawls upon opposite sides ofthe ratchet-wheel causing one to engage with its teeth when the lever Nis rocked in one direction, and the other to engage with the teeth whenthe lever is rocked in the opposite direction, whereby a movement of thefeed mechanism of the cutters is produced at the end of each traverse ofthe carriage.

Vithin a. long slot, m, in the cross-head K is hung on pivots n therocking cutter stock or holder 1, to which are secured, by bolts 1), thescraping knives or cutters q T, which act upon the surface of the stoneand plane its surface as required. The cutters are shaped at their lowerends as seen in Figs. 3, 4, 7, and 9, and are arranged back to back, sothat when the stock P is inclined to one side in the slot m thecutting-edge 20 of the knife q will be in a position to act upon andscrape the surface of the stone 0 while traveling in the direction ofthe arrow, the edge of the other knife, 1', being raised out of contactwith the stone, while when the stock P is thrown over in the oppositedirection the cutting-edge of the knife 1' will be brought into contactwith the stone, ready to scrape or plane the same while traveling in adirection contrary to the arrow, the knife q being then raised out ofcontact with the stone; and by this construc tion it will be seen thatthe stone is planed at each traverse of the carriage, thus avoiding muchloss of time and effecting a material saving in the cost of dressing orpreparing the surface of lithographic and other soft stones.

The oscillation of the cutter-stock 1? is effected in the followingmanner: To one end of the stock is secured a toothed segment, 8', whichengages with a similar segment, t, secured to one end of a short shaft,u, supported in a bearing, w, in one end of the cross-head K. Theopposite end of the shaft a has secured to it a lever, o the lower endof which is connected'by a rod, 11 with the lever N, so that as thelatter is rocked the cutters are shifted, the movement of the cutterstaking place just previous to the arrival of the stone 0 at the end ofits traverse in either direction, and at the same instant that thecutters are shifted the downward feed of the crosshead with thecutterstock is produced, to cause the next cutter to be loweredsufficiently to shave off a fresh portion of the surface of the stone.The slot 15 at the upper end of the lever t affords the necessary amountof lost motion to prevent the belts from being shifted until the lever Nhas nearly completed its movement in either direction, as is necessaryto insure the cutters being oscillated for the succeeding out before thebelts are shifted to cause the stone to travel in the oppositedirection.

The cutters are made adjustable vertically in the stock P by means ofscrews 0, any suitable number of which may be employed at differentportions of the length of the cutters.

. By means of these screws, which pass through the upper portion of thestock into the cutters, the latter can be adjusted to a perfect leveltransversely with the carriage B, on whieh'the stone rests, and exactlyon a level with each other, in order to insure a cut of uni- .form depthat each traverse of the carriage,

and a uniform action over all portions of the surface of the stone,which is thus given a uniform level surface, as required to produceperfect work.

The projections '12 w are made adjustable in the direction of the lengthof the frame-work by means of nuts 25 and bolts d, the heads of thelatter being adapted to slide in a dovetailed groove, 6, in the side ofthe carriage B, and by means of this adjustment the rocking of the shaftH can be effected at any desired part of the traverse of the carriage Bto reverse the direction of its motion when the end of the stone isreached by the cutter, the point where the reversal occurs dependingupon the length of the stone upon the carriage.

\Vhen it is desired to raise the cross-head K with its cutters toaccommodate stones of varying thicknesses, or for any other purpose,

head K, and provided with a pair of cutters,-

q 4,- adapted to be alternately brought into contact with the stone atopposite ends of its traverse, the toothed segments 8 t, shaft u,

lever a ,'rod If, lever N, and means, substantially as described, foroscillating the said lever N at each traverse of the carriage, allconstructed to operate substantially in the manner and for the purposedescribed.

2. In a stone-planing machine, the combination, with thevertically-movable cross-head K, sliding in slots in the standards I,and provided With'an oscillating cutter-stock, P, having a pair ofcutters, q 1', adapted to be alternately brought into contact with thestone at opposite ends of its traverse, of the screwshafts b,.adapted tosupport the cross-head,

and provided at their upper ends with wormgears c, "rotated by worms don the horizontal shaft M, located above the cap-piece L, theratchet-wheel e on the shaft M, rotated by the pawls f g on the levers hi, oscillating upon the shaft M, and connected by rods k l, with thelever N on the rock-shaft H, the lever u on the said shaft H,'and theprojections v w on the carriage B, adapted to vibrate the lever toalternately in opposite directions, all constructed and arranged tooperate substantially in the mannerand for the purpose described.

3'. In a stone-planing machine, the combination, with a rockingcutter-stock, P, supported within the cross-head K, of the two cutters q1", extending transversely across the entire width of the carriage B,and each made adjustable vertically at different portions of its lengthby means of screws 0, whereby each cutter can be adjusted to a perfectlevel transversely with the carriage, substantially as set forth.

4. In a stone-planing machine, the combination of the reciprocatingcarriage B, the oscillating cutter-stock I, pivoted to the crosshead K,and provided with the cutters q r, means, substantially as described,for oscillating the cutters, the shaft H, connected with the mechanismfor oscillating the cutters, and

operated by the projections 22. w on the carriage B, the lever t,secured to the shaft H. and provided with a slot, 15, the connecting-rod8, bar 1", sliding in standards above the pulleys g and h, andbelt-shippers m n, secured to the sliding bar 4, all constructed andarranged to operate substantially in the manner and for thepurposedescribed. I

Witness my hand this 24th day of May, A. D. 1883.

FRANCIS MEIsEL.

In presence of- P. E. TESOHEMACHER, JAMES (ISHoUr.

